Edit: the heat transfer increases with turbulent flow compared to laminar flow, so it is a bit more complicated to optimize. I think the optimal pipe lengths will also vary depending on whether the system is open loop or closed loop.

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Over the weekend I went trail running and paid more attention to the pools at the houses below. Most houses don't have pools, so it's likely that the majority of residential electricity use is AC and not pool heating. Of the houses that do have pools, it's hard to tell from a distance the difference between a solar panel and a solar collector, and house with nothing on the roof: hard to know whether the pool is heated or unheated. I did see one pool that was either navy blue or royal blue, difficult to tell for sure on a cloudy day. I thought it looked nice.